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PROJ00427
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Last modified
11/19/2009 11:43:25 AM
Creation date
10/5/2006 11:54:50 PM
Metadata
Fields
Template:
Loan Projects
Contract/PO #
FS0028X
Contractor Name
Avery Lake USBR 1976
Contract Type
Miscellaneous
Water District
0
County
Rio Blanco
Loan Projects - Doc Type
Feasibility Study
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<br />The tentative selection of this new site necessitates a different alignment <br />and design for the feeder system, including the diversion structure. <br />Construction of the Sawmill Mountain Reservoir would remove the need for <br />Avery Pumping Plant. A proposed change unrelated to the new reservoir site <br />is the deletion of an Oil Shale Diversion Dam from the plan. All other <br />features of the,White River Segment would remain unchanged and there would <br />be no change at all in the Milk Creek Segment. <br /> <br />The dropping of Lake Avery enlargement from consideration is neces- <br />sary because of unacceptable abutment conditions. A routine investigation <br />of foundation and abutment suitability by means of geologic core drilling <br />along ,the axis revealed severe problems with the left abutment. Gravel <br />deposits at depths in excess of 100 feet were found. A cross-section <br />drawing of the axis is shown on the following page. Even if the axis <br />were lengthened and the gravel excavated, there is no indication that <br />competent bedrock exists. <br /> <br />Before the modified plan can be definitely adopted, much additional <br />work is needed to verify and upgrade the preliminary investigations which <br />are based entirely on existing appraisal-level data. <br /> <br />Hydrologic data will have to be expanded to cover reaches of both <br />Big Beaver Creek and the North Fork of the White River upstream from <br />previously studied points. Additional geologic drilling will be needed <br />to confirm the suitability of the new dam site and tunnel route. It will <br />be necessary to perform topographic mapping of the reservoir basin and <br />feeder system alignment. Icing studies must be made to aid in the design <br />of a diversion structure and to help establish winter operation schedules. <br />'The fish and wildlife studies that are already underway have been extended <br />to provide additional detail in relation to the proposed relocation of <br />features. <br /> <br /> <br />Description of the Modified Plan <br /> <br />The modified MOP Compromise Plan based on Sawmill Mountain Reservoir <br />would provide exactly the same water supply at the same locations for the <br />same purposes as the Lake Avery plan would have provided. The new feeder <br />system alignment necessitated by Sawmill Mountain Reservoir's location <br />includes a tunnel and pipeline from the North Fork, as shown on page 5. <br />The tunnel portion has been named the Bob Raley Tunnel. <br /> <br />.,-',.... <br /> <br />'. <br /> <br />Design Considerations <br /> <br />Sawmill Reservoir <br /> <br />To meet the project demands in the MOP Compromise Plan, the Sawmill <br />Mountain Reservoir would be sized to a total capacity of 55,000 acre-feet. <br />Of this, 52,000 acre-feet would be active capacity and 3,000 acre-feet <br />would be for dead and inactive storage. The minimum pool wou~d~e only <br />tor sediment storage and to provide the water surface elevation necessary <br /> <br />3 <br />
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